Improvement in drilling-machines



J. G. HIRzEL.

METAL-DRILL. No. 53,145. Patentgd March 13, 1866.

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- ffy/@W ZSheets-Sheet 2. J. Cir.,4 HIRZEL.

N. PETERS. FHOT0LITHOGRAPHEH. WASHINGTON. D C.

UNITED STATES `PATENT OFFICE.

IMPROVEMENT INDRILLlNG-IVIACHINES.

Specification forming part of Letters Patent No. 53,1415, dated March13, 1856.

of the machine without the appendage fordrilling oval holes. Fig. 2 is aleft-handed perspective view of the machine. Fig. 3 is a view of thatportion of the machine which is used when drilling oval holes,showingvthe face thereof. Fig. 4 is a drawing showing` the arm or footwith slide holding the drill-.

bit which traverses the ways set in this foot. Fig. 5 is a drawing ofthedrill-bit with its guiding-heel by which it traverses the ways Vin thisfoot-piece.

I compose my drill of iron or steel, as the particular part thereof mayrequire.

The wheels are set as shown in the drawings, gearing together andcoupled by means of couplings in the axes and a slide set upon theboxing, reaching to and resting upon the upper pinion wheel. I provide ascrew for feeding down the drill, as required, worked by means of aratchet in connection with a ratchet-wheel, rod, and lever working upona pin set in the inside face of the lower wheel.

In Figs. l and 2, a a are the slide-ways in which the drill slides infeeding. b is the feeding-screw. cis the ratchet which works upon thewheel d in feeding. e is the rod which li'ts the ratchet by ineans'otthe le- "erf g is the slide-coupling for working the upper pinion-wheel,h. i is a bevel pinionwheel working into a corresponding stationarypinion-wheel, and turning the drill. This stationary pinion-wheel is setupon the lower larger wheel, l.

lc is a pinion-wheel working into the large wheel l, which is uncoupledby means of the thumb-screw in the axis at on. A similar screw is set inthe upper axis for coupling and uncoupling.

In Fig. 3, b is that part of the foot-piece which slides into the ways aa. (Shown in Figs. 1 and 2.) In feeding, a is the foot-piece holding theslide b, by means of which the drill-bit traverses the ways'e c, whichgives the shape and size of the oval hole.

In Fig. 4t, g is the axis of the foot-piece. a is the foot itself 5 b,the slide holding the drillbit c.

Fig. 5 is the drill-bit c with its heel o.

This machine may be worked with hand or power, and by removing the drillfrom the ways it can be used in place of a ratchet-drill.

In drilling oval holes, very little feed being required, the operationof the ratchet-wheel may be dispensed with by sliding back the arm orlever or raising the ratchet, and to regulate the speed v'of feed thelever is advanced or withdrawn by means of the screw in the slotted partof the arm at s. In using this in lieu of a ratchet-drill an a-rm shouldbe placed in the center of the back to keep it square in its place.

For obtaining the slowestmotion for cutting oval holes in boilers Iconnect the lower pinion, 7c, with the upper wheel, c, and the upperpinion, L, with the lower wheel, l, operating with the crank on thelower axle.

The machine has three faster motions for drilling or boring holessmaller than the ones above described. The next faster motion isobtained by connecting the upper pinion, h, with the lower wheel, l, bymeans of slidecoupling g, and uncoupling lower pinion, k, operating withcrank on the upper'axle. The next faster motion is obtained byuncoupling the upper pinion, h, and wheel c, operating with crank onloweraxle. Thelast and fastest motion is obtained by connecting thelarge wheel o with the lower pinion-wheel, la, and disconnecting theupper pinion operating with crank on upper axle.

I do not claim any part of this machine by itself, as I am well satisedthat its component parts are well known, and have been used long sincein other machines; but

W'hat I claim asY my invention, and desire to secure by Letters Patent,is-

The combination of the wheels, pinions,

slides, ways, plates, spring, screw, and couplings, foot-piece withslide, and drill-bit with heel, as arranged and described, for drillingoval or round holes, constituting a portable metallic self-actinghand-drill.

J. G. HIRZEL. Witnesses:

- Enwn. W. HooPEs, WM. B. WIGGINS.

